he said, "mr. president, don't think for one minute i don't hold you ultimately responsible for benghazi." senator mccain took his rebuttal to the senate floor. >> we believe whoever it is must be held responsible, i say, to the president of the united states. most importantly, the president of the united states who is commander in chief. who so far, in my view, has not exercise ed those responsibilits and not informed the american people of the facts. >> president obama also weighed in during that news conference on the scandal that ended the career of general david petraeus who resigned last week from the cia after a federal investigation exposed his extramarital affair. yesterday the president thanked petraeus for his years of service telling reporters that so far there is no evidence that national security was compromised. >>> meanwhile, the fbi agent who helped trigger an investigation that ultimately led to petraeus has been identified as this man, frederick humphries. humphries kick started